High temperature characteristics of synthetic hydroxyapatite

Zhou, Jiming; Zhang, Xingdong; Chen, Jiyong; Zeng, S.M.; Groot, K. de

doi:10.1007/bf00122983

Cited by 197 publications

(146 citation statements)

References 4 publications

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“…However, CaO was not found in their experiment [25], and neither in ours. It is believed that the initial decomposition temperature of HAP is between 1100 � C and 1200 � C [26], which is related to the powder properties and preparation conditions.…”

Section: Decomposition Mechanismcontrasting

confidence: 69%

The microstructure evolution of nanohydroxapatite powder sintered for bone tissue engineering

Shuai¹,

Nie

Gao

et al. 2013

Journal of Experimental Nanoscience

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Nanotechnology has been widely used to overcome the brittleness of coarse ceramics. Laser sintering is an effective approach for the preparation of nanoceramics due to the laser properties such as high energy density and rapid heating. In this study, the nanohydroxypatite (HAP) was used to prepare for artificial bone scaffold using a home-made selective laser sintering (SLS) system. The microstructure and the properties of the sintered nanoHAP are tested with scanning electron microscopy, X-ray diffraction and Fourier transform infrared spectroscopy. We found that the shape of nanoHAP particle changes from long needle-like to spherical or ellipsoidal after sintering, and the HAP particles grow up until they merge together with the increasing temperature. The tendency of preferred orientation reduces and the degree of crystallinity increases with the growth of nanoHAP. HAP dehydroxylation occurs during sintering. HAP decomposes to tetracalcium phosphate and -calcium phosphate when the sintering temperature is over 1354 C (the laser power is 8.75 W). Sintered nanoHAP maintains a high degree of crystalline and nanometre scale when the laser power is 7.50 W, spot radius 2 mm, sintering time 4 s and thickness of the layer is 0.2 mm. This study presented the optimised technology parameters for the preparation of nanoceramics with a novel SLS system and demonstrated that the nanoceramics with nanosize scale can be obtained by this system.

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Section: Decomposition Mechanismcontrasting

confidence: 69%

The microstructure evolution of nanohydroxapatite powder sintered for bone tissue engineering

Shuai¹,

Nie

Gao

et al. 2013

Journal of Experimental Nanoscience

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“…Upon calcination of these amorphous powders, in a stagnant air atmosphere, at 1100 C for 6 h, they completely transformed into crystalline, single-phase HA. However, it has long been a wellcon®rmed experimental fact 6,8,10 that the synthetically prepared (via aqueous chemical precipitation techniques) HA powders usually decomposed (partially) into tri-calcium phosphate (Ca 3 (PO 4 ) 2 ), calcium pyrophosphate (Ca 2 P 2 O 7 ), tetra calcium phosphate (Ca 4 P 2 O 9 ), and/or into oxyapatite (Ca 10 (PO 4 ) 6 O) when heated above 1200 C in air. The HA precipitates of this study formed in`pure SBF' solutions, uncommonly, had an excellent thermal stability even when heated at 1600 C for 6 h in an air atmosphere.…”

Section: Resultsmentioning

confidence: 99%

“…4) and temperature (37 C), in SBF solutions rich in urea. K. de Groot et al, 8 studied the high-temperature characteristics of synthetic HA and reported that the synthetic HA with a Ca/P ratio near to 1 . 67 was only stable below 1200 C, when sintered in a dry or wet air atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Chemical preparation of carbonated calcium hydroxyapatite powders at 37°C in urea-containing synthetic body fluids

Bayraktar¹,

Taş²

1999

Journal of the European Ceramic Society

129

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An important inorganic phase of synthetic bone applications, calcium hydroxyapatite (HA, Ca 10 (PO 4 ) 6 (OH) 2 ), was prepared as a single-phase ceramic powder. Carbonated HA powders were formed from calcium nitrate tetrahydrate and diammonium hydrogen phosphate salts dissolved in aqueous`synthetic body¯uid' (SBF) solutions, containing urea (H 2 NCONH 2 ), at 37 C and pH of 7 . 4, by using a novel chemical precipitation technique. These powders were also found to contain trace amounts of Na and Mg impurities in them, originated from the use of SBF solutions, instead of pure water, during their synthesis. The characterization and chemical analysis of the synthesized powders were performed by powder X-ray diraction (XRD), Fourier-transformed infra-red spectroscopy (FT±IR), and inductively-coupled plasma atomic emission spectroscopy (ICP±AES). #

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“…Aprox. a 1300°C se observa otro aumento en el calor, lo cual podría deberse a cambios polimórficos de la hidroxiapatita [17], [18]. Lo cambios sufridos por la HAp posterior a los 400°C no resultan importante para este trabajo ya que ningún polímero fue procesado a temperaturas superiores a esta.…”

Section: Resultados Y Discusión Caracterización De Los Materiales Anáunclassified

Fabricación de filamentos de PCL y PVA reforzados con HAp para ser usados en impresión 3D

Guillén-Girón¹

2018

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El objetivo principal de este trabajo fue la fabricación de filamentos de alcohol polivinílico (PVA) y policaprolactona (PCL) para ser usados en impresión 3D con tecnología de modelado por deposición fundida de filamentos (FDM). El estudio se orientó primeramente en fabricar los filamentos de estos biopolímeros por extrusión y posteriormente estos se reforzaron internamente con hidroxiapatita (HAp) para así mejorar sus propiedades mecánicas. Previo al proceso de manufactura, el PVA, PCL y HAp se caracterizaron usando difracción de rayos-X para evidenciar el grado de ordenamiento cristalográfico de las cadenas poliméricas. La espectroscopia infrarroja se usó para observar los grupos funcionales presentes en estos polímeros y consecuentemente su posible influencia durante el procesamiento por extrusión. Análisis térmicos fueron vitales para establecer las condiciones de manufactura incluyendo la temperatura de fusión y degradación de estos polímeros y HAp. Finalmente, los filamentos fueron analizados por microscopia electrónica. Este estudio permitió evidenciar los retos aun existentes en la manufactura de implantes por medio de impresión 3D usando biopolímeros. Los resultados obtenidos demuestran que atención cuidadosa debe brindarse a la obtención de los filamentos de estos biomateriales para desarrollar futuramente implantes funcionales y personalizados.

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High temperature characteristics of synthetic hydroxyapatite

Cited by 197 publications

References 4 publications

The microstructure evolution of nanohydroxapatite powder sintered for bone tissue engineering

The microstructure evolution of nanohydroxapatite powder sintered for bone tissue engineering

Chemical preparation of carbonated calcium hydroxyapatite powders at 37°C in urea-containing synthetic body fluids

Fabricación de filamentos de PCL y PVA reforzados con HAp para ser usados en impresión 3D

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